CMF / CRF Details

CMF ID: 6047

Implement mobile speed cameras

Description: Implement mobile speed cameras

Prior Condition:  Roadways without speed cameras

Category: Advanced technology and ITS

Study: Reducing Road Traffic Injuries: Effectiveness of Speed Cameras in an Urban Setting, Pérez et al., 2007

Star Quality Rating:2 Stars  [View score details]
Rating Points Total:40
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.056
Crash Reduction Factor (CRF)
Value:27  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:5.6
Crash Type:All
Crash Severity:All
Roadway Types:Principal Arterial Other
Street Type:
Minimum Number of Lanes:6
Maximum Number of Lanes:6
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Divided by Median
Minimum Speed Limit:80
Maximum Speed Limit:80
Speed Unit:km/h
Speed Limit Comment:
Area Type:Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:2001 to 2005
Type of Methodology Used:Before/after using comparison group
Sample Size (crashes):1276 crashes before, 972 crashes after
Sample Size (miles):15 miles before, 15 miles after
Sample Size (miles):34 mile-years before, 30 mile-years after
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 08, 2014
Comments:The method used in the analysis was a time-series study with a comparison group. The before time period was limited (2.25 years).